IssuersActivity.java

public class IssuersActivity extends Activity {

  private String mMerchantPublicKey;
  private String mPaymentMethodId;
    
    @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_issuers);
      
      mMerchantPublicKey = this.getIntent().getStringExtra("merchantPublicKey");
      mPaymentMethodId = this.getIntent().getStringExtra("paymentMethodId");
      
      MercadoPago mercadoPago = new MercadoPago.Builder()
              .setContext(this)
              .setPublicKey(mMerchantPublicKey)
              .build();
      getIssuersAsync(mercadoPago);
  }
  
  private void getIssuersAsync(MercadoPago mercadoPago) {

    mercadoPago.getIssuers(mPaymentMethodId, new Callback <List<Issuers>>() {
        @Override
        public void success(List<Issuers> issuers, Response response) {
          // Ya tenés la lista de bancos!
          // Ahora armá tu UI para cada uno de ellos!
        }
  
        @Override
        public void failure(RetrofitError error) {
          // UPS! Algo salió mal.
        }
    });
  }
}